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The energy released by the fission of one uranium atom is 200 MeV. The number of fission per second required to produce 6.4 W power is.

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Important Questions on Atoms, Molecules and Nuclei

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Assertion: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion. Reason: For heavy nuclei, the binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

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A particle is dropped from a height 'H'. The de-Broglie wavelength of the particle depends on height as.

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The number of de-Broglie wavelengths contained in the second Bohr orbit of the hydrogen atom is.
 
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Match List-I (Fundamental Experiment) with List-II (its conclusion) and select the correct option from the choices given below the list:

  List-I   List-II
(a) Franck-Herfz experiment (i) Particle nature of light
(b) Photo-electric experiment (ii) Discrete energy levels of atom
(c) Davison-Germer experiment (iii) Wave nature of electron
    (iv) Structure of atom

 

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Two radioactive materials, X1 and X2 have decay constants 5λ and λ, respectively. If initially, they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be  1e after time equal to,
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An electron in the ground state of a hydrogen atom is revolving in anticlockwise direction in the circular orbit of radius R. The atom is placed in a uniform magnetic induction B such that the plane normal of the electron orbit makes an angle 60° with the magnetic induction. The torque experienced by the electron is,

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What amount of energy should be added to an electron to reduce its de-Broglie wavelength from 200 pm to 100 pm?
 
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In the process of nuclear fission of 1 g uranium, the mass lost is 0.90 milligram. The efficiency of power station run by it is 10%. To obtain 200 megawatt. power from the power station, the uranium required per hour is c=3×108m s-1